The couple looked at party decorations for Geoffrey's birthday party later that night in Melbourne, and the 25-year-old model wore a matching white crop top and high-waisted skirt combination, with the tiny top unable to protect her modesty.
Fun: Gabi got in on the fun as well wearing a pair of novelty sunglasses with a mustache attached Gabi got in on the fun as well, wearing a pair of novelty sunglasses with a mustache attached.
It wasn't long before the couple, who Gabi has said are married in the 'legal sense,' began trying on a variety of different masks and hats.
Gabi, who was charged with offensive behaviour in Melbourne last year for taking a nude stroll, didn't seem to care as she reached to grab something high up in the store and her shirt exposed her breast.
Last month she revealed to Daily Mail Australia that she and Geoffrey are now legally wed, but are planning an extravagant ceremony for later this year.
Her father Michael, a celebrity hairdresser, died of a cocaine overdose when she was 12 years old.